Engine cylinder-head.



Patented Dec. 25, |900.

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ROBERT L. AMBROSE, OF TARRYTOWN, NEW YORK, ASSIGNOR TO THE RAND DRILL COMPANY, OF NEW YORK, N. Y.

ENGINE CYLlNDERJ-HEA.l

SPECIFICATION forming part of Letters Patent No'. 664;453, dated December 25; Application led May 9, 1900. Serial No. 16,017l (No model.)

T0 all whom t may oon/cern:

Be it known that I, ROBERT L. AMBROSE, a citizen of the United States of America, and a resident of Tarrytown, county of Westchester, State of New York, have invented a new and useful Improvement in Engine Cylinder- Heads, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in cylinder-heads, and particularly to improvements in the lower heads for the cylinders of power rock-drills.

My invention consists in constructing the cylinder-head in two parts, each part having formed therein a semicircular recess, in constructing a bushing, also in two parts, and fitting it to the said head, each of the two parts of the bushing having a semicircular Iiange adapted to engage with the corresponding recesses in the cylinder-head members, and providing a packing-ring having a flange portion adapted to tit into the recesses and be heldin place between the sides of the recesses and the ends of the bushing members. ,i

The object of my invention is to construct a divisible cylinder-head and provide the same with a readily removable and replaceable wearing-bushing and to provide a simple packing means which shall be securely held in place without the provision of independent means for so doing.

I will now proceed to describe a cylinderhead embodying my invention and will then point out the novel features in claims.

In the drawings, Figure l represents ahorizontal sectional view of a portion of a rockdrill provided with a cylinder-head embodying my invention. Fig. 2 is a transverse section on the line 2 2 of Fig. l. Fig. 3 is a View of one of the cylinder-head members and one of the bushing members disassembled.

Similar reference characters designate corresponding parts throughout the several views.

I have shown my improved cylinder-head as applied to a rock-drill and have shown certain parts of the rock-drill in combination therewith. I, however, do not wish to be limited to the use of the same for rock-drill cylinders, as my invention is obviously applicable to cylinders used in connection with other machinery. My invention, however, is particularly applicable to rock-drills by reason of the fact that it is customary at the present day to make the rock-drill piston, piston-rod, and drill-chuck all in one piece. This construction necessitates a split cylinder-head, and thepurpose of this invention is to construct asplit cylinder-head which shall have all the advantages that accrue to the most preferred form of solid head.

Reference character l designates the cylinder of a rock-drill; 2, a piston fitted thereto; 3, a piston-rod which is in one piece with the said piston 2, and 4 a drill-chuck which is in one piece with the piston-rod 3.

5 designates my improved Lower cylinderhead as a whole. The said cylinder-head comprises two members 6 and 6, each of the said members having a semicircular recess 7. Fitted to each of the members 6 is one-half of a sleeve or bushing, each one-half comprising a member 8, provided with a semicircular iiange 9. Each of the semicircular flanges 9 fits into its corresponding recess 7 in the members 6 6, and the outer diameter of the main portion of the bushing 8 is of the same size as the inside diameter of the main portion of the head members 6.

The outer portion of the head members 6 is tapered, as at l0, and a ring ll, having a tapered bore, is fitted to the said tapered portion and is drawn up by suitable bolts l2, which are secured to the drill and which not only draw the head members together, but secure the cylinder members as a whole to the cylinder l.

A packing-ring 13 surrounds the piston-rod 3 and is fitted to the rear end of the cylinderhead 5. The packing-ring 13 is preferably of the type known as hydraulic packing and may be conveniently formed of a ring of 'ably open to the interior of the cylinder l.

This is in order that the motive fluid within IOO the cylinder', which is ordinarily compressed air, mayhave a chance to Work around Athe packing-ring and force the same into close proximity with the piston-rod while the piston and its rod are moving forwardly. While moving in the. other direction, the pressure upon the packing will be relieved to a certain extent, and the piston-rod 3 will be permitted to move freely.

It will be noted that the Bange 14c of the packing-ring 13 extends into only a portion of the depth of the recesses 7 7 in the head members 6. 6,thro.u ghout the balance of the recesses the flange of the bushing members occupying the entire width. bushing members 8 are held securely in posi'tion against longitudinal move-ment, while at the sam-e time provision is made for retaining the packing-ring 13 in position in the simplest possible manner.

By my arrangement and construction of parts I have provided a two-part cylinderhead having a desired form of packing-ring and having a suitable bushing of extremely simple and inexpensive construction. In cylinder-heads of this type and for tools of this description it is essential that they may be Vprovided with a renewable lining or wearing bushing, for the reason that the wear on theseparts, owing to both friction and shock, is very great. It is further desirable, for the reason that the piston-rod itself being `of a fibrous material it is advantageous to construct the Wearing portion of the cyl-inderhead of such material as cast-iron. Cast-iron would not be a suitable metal for the entire head, for the reason that it would be liable to be broken on account of the shocks which it has to withstand.

By my improved arrangement and construction I am enabled to make the head mem- In this way the` theV busheration being simple and one quickly per-' formed.l

What l claim is- 1.. The combination with acylindenot' a cylinder-head comprising two members, each having formed therein semicircular recesses, a bushing composed of two members, each having a semicircu'lar flange adapted to engage with the said recesses, means for securing the head members together, and a packing-ring having a flange portion, arranged to fit, and adapted to be held in place', between the sides of the recesses and theends of the bushing members.

2. Thecombinatifon with a cylinder,of acylinder-head comprising two members, each havin g formed therein semicircular recesses, a bushing composed of two members, each having a semicircular ange adapted to engagevwith the said recesses, a packing-ring having a fla-nge portionl which `is fit-ted to, and. adapted to be held in place in, a cut-away portion between the ends of the bushing members and the walls of the said recesses, the said cut-away `portion extending but a portion of the depth of the said recesses, and means for securing the vhead members together.

ROBERT L. AMBROSE.

Witnesses:

HUGH V. CONRAD, WILLIAM S. BARNUM. 

